JP2010014267A - Blocking device for fire resistive dual collecting pipe joint - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a blocking device capable of simply and inexpensively coping with increase of branch pipes without deteriorating fire resistive property. <P>SOLUTION: The blocking device 1 is composed of a short pipe 3 of synthetic resin having an end 8 fitted and adhered to a branch pipe connection opening 9 which is provided in a joint inner pipe 2a of a fire resistive dual collecting pipe joint 2, a cap 5 of synthetic resin adhered to the other end of the short pipe and coated with fiber mixed mortar, a mortar pipe 6 loosely fitted onto an outer periphery of the short pipe with a fitted-in portion 10 left for the branch pipe connection opening, and a fire resistive tape-like joint 7 wound on an outer peripheral surface of a connection part between a cap and the mortar pipe. A gap 11, in which a cutting tool 13 for cutting the short pipe can enter, is provided in the connection part, the length of the mortar pipe is set to be a length suited for fitting of a piping socket 20 and the outer diameter of the mortar pipe is set to be larger than the outer diameter of the joint inner pipe. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a closing device applied to a connection port of a fireproof two-layer collecting pipe joint.

  Conventionally, a refractory two-layer assembly pipe joint having a structure in which a fiber-mixed mortar coating layer is formed on an inner tube made of synthetic resin is known, and the inner tube having good drainage but weak against heat is protected with a coating layer of mortar. It has come to have safety against fire. In addition, some of these types of joints are provided with a plurality of branch pipe connection ports, which are provided, for example, in the middle of a drainage vertical pipe of a multi-layer building to join drainage from a plurality of branch pipes. (See Japanese Patent No. 3567427). In such a joint type fireproof two-layer collecting pipe joint, for example, when draining from two systems of a toilet and a bathtub, the number according to the number of branch pipes to be connected, such as draining from three systems of a toilet, a bathtub, and a kitchen The one having a branch pipe connection port is used.

  In building construction work, drainage pipes are installed at a relatively early stage, but this is a case where housing equipment such as toilets and bathtubs used in the building has been determined, and the floor plan has yet to be decided. When it is not fixed, the drainage system cannot be constructed, and there is a disadvantage that the construction period of the piping is prolonged. In addition, if the number of branch pipes decreases due to changes in equipment, etc., it is only necessary to permanently close the branch pipe connection port or branch pipe using a fire-resistant member in a reliable way that does not leak water. When the number of branch pipes increases from the number of branch pipes of the joint, etc., it is necessary to replace the entire collecting pipe joint. .

Also, in conventional piping work, it has adhesiveness to close the gap generated at the connection part of the fireproof two-layer collecting pipe joint and branch pipe, and prevent the inner pipe of the fireproof two-layer pipe from being damaged by the heat of the fire A fire-resistant tape-like joint is wound around the connecting portion (see Japanese Patent Application Laid-Open No. 2004-150619).
Japanese Patent No. 3567427 JP 2004-150619 A

  The inconvenience that it is not possible to cope with the increase in the branch pipes described above is that a fireproof two-layer collecting pipe joint with a large number of branch pipe connection ports is attached to the drainage system in advance, and unnecessary branch pipe connection ports are detachably sealed with sealing plugs. We thought that it could be solved by temporarily fixing, but if the sealing plug is screwed to the inner tube made of synthetic resin, there is a risk of water leakage due to loosening of the screw, and fire resistance is impaired by simple means It has been difficult to provide a sealing plug without being detachable.

  An object of the present invention is to provide a closing device that can solve the disadvantages of a fireproof two-layer collecting pipe joint and can easily and inexpensively cope with an increase in branch pipes without impairing fire resistance.

  In the present invention, in order to solve the above-mentioned problems, a synthetic resin short pipe having one end fitted into and bonded to a branch pipe connection port provided in a synthetic resin joint inner pipe of a fireproof two-layer collecting pipe joint, A synthetic resin cap bonded to the other end of the short pipe and covered with a fiber-mixed mortar, and a fiber-mixed mortar loosely fitted on the outer periphery of the short pipe in a state in which a fitting allowance is left in the branch pipe connection port The mortar pipe made of the product and a refractory tape-shaped joint wound around the outer peripheral surface of the connecting portion of the cap and the mortar pipe.

  It is preferable to provide a gap between the mortar pipe and the cap so that a blade for cutting a short pipe can enter. The length of the mortar pipe is set to a length suitable for fitting a pipe socket. The outer diameter is preferably formed larger than the outer diameter of the joint inner pipe.

  The apparatus of the present invention closes a branch pipe connection port that is not used for the contact of a fireproof two-layer collecting pipe joint by inserting and bonding one end of a short pipe of the apparatus. When an additional drainage system is requested, the tape joint is peeled off to expose the connecting part of the mortar pipe and cap, and a knife such as a saw is inserted into this connecting part to cut the short pipe, and the cap is connected to the short pipe. Separate with part of Then, pull out the mortar pipe from the part of the short pipe that remains adhered to the branch pipe connection port, connect a commercially available fireproof pipe socket to this short pipe part, and then connect the drain pipe to be added to the pipe socket. Easily release the blockage and add branch pipes. Furthermore, since it is possible to freely change the number of drainage systems, if a collecting pipe joint with many connection ports is prepared in advance, the collecting pipe joint, vertical pipe, and branch pipe can be connected without waiting for the number to be confirmed. It is also possible to reduce the piping time by proceeding with the work.

  When the mortar-covered cap is pre-bonded to the end of the short tube with an adhesive, and the tape is jointed with the mortar tube inserted through the short tube, the closure device is integrated, so the short tube It can be easily closed by simply fitting the end part into the branch pipe connection port using an adhesive, and is convenient for transportation. The connection port is sealed with a bonded cap, so there is no water leakage. Sufficient fire resistance can be maintained because it is surrounded by a mortar tube, a fire-resistant tape joint, and a mortar-covered cap. In addition, the time which attaches the apparatus of this invention to the branch pipe connection port of a fireproof two-layer pipe joint may be before or after pipe construction of this joint.

  When the tape-shaped joint is wound, a gap is formed in the connecting portion between the mortar tube and the cap so that the cutting tool for cutting the short tube can be easily inserted. This makes it easier to enter the blade.

  By setting the length of the mortar pipe to a length suitable for fitting the pipe socket, the short pipe can be cut without measuring the dimensions. By forming the outer diameter larger than the outer diameter of the joint inner pipe, the end face of the joint inner pipe exposed at the end of the branch pipe connection port when the closing device is attached can be covered with the mortar pipe. This improves the safety against fire by protecting the inner pipe of the joint from heat in the event of a fire.

  An embodiment of the present invention will be described with reference to the attached drawings. In FIGS. 1, 2 and 4, reference numeral 1 represents a closing device for a fire-resistant double-layered joint according to the present invention, and reference numeral 2 in FIG. 5 represents a closing device according to the present invention. 1 shows a refractory double-layer collecting pipe joint having three branch pipe connection ports 9 to which 1 is applied. The closure device 1 has a short pipe 3 made of hard vinyl chloride, one end 8 of which is fitted into the branch pipe connection port 9 and bonded thereto, and is bonded to the other end 12 of the short pipe 3 and covered with a fiber mixed mortar 4. The cap 5 and the mortar tube 6 so as to cover the cap 5 made of synthetic resin, the mortar tube 6 made of fiber-mixed mortar loosely fitted around the outer periphery of the short tube 3, and the connecting portion of the cap 5 and the mortar tube 6. And a refractory tape joint 7 wound around the outer peripheral surface of the mortar pipe 6. The mortar pipe 6 is loose with the insertion allowance 10 for the branch pipe connection port 9 left on one end side of the short pipe 3. Fitted.

  In the example shown in the figure, a gap 11 is formed at the connecting portion of the cap 5 and the mortar tube 6, and a blade 13 for cutting the short tube 3 enters the short tube 3 without being obstructed by the mortar tube 6. Can be cut.

  As shown in FIG. 4, the fireproof two-layer assembly pipe joint 2 has a configuration in which a hard vinyl chloride joint inner pipe 2a is covered with a fiber-mixed mortar layer 2b, and branches of the fiber-mixed mortar layer 2b. A heat-expandable joint material 2c is attached to the end face located at the pipe connection port 9, and in the event of a fire, this expands to prevent heat from entering between the mortar pipe 6 of the closure device 1 connected, and synthetic resin It was made to prevent damage to the manufactured joint inner pipe 2a. Further, by forming the outer diameter of the mortar pipe 6 larger than the outer diameter of the joint inner pipe 2a, the end face of the joint inner pipe 2a can be covered with the connected mortar pipe 6, and heat is generated in the event of a fire. Since it can prevent acting on the joint inner pipe 2a, a fireproof armor such as wrapping of a thermally expandable joint is not required at the branch pipe connection port 9 portion.

  An example of the structure of the tape-like joint 7 is as shown in FIG. 3. A fired and carbonized acrylic fiber fabric 15 is impregnated with a flame retardant adhesive, and the fabric 15 is made of aluminum through a glass fiber mesh 16. The commercial item of the structure which laminated | stacked the foil 14 was used. This joint has a performance to withstand the heat of the fire, prevents the heat of the fire from entering the gap 11, and prevents the inner pipe 2a and the short pipe 3 from being damaged.

  The refractory two-layer assembly pipe joint 2 is embedded in a floor slab 17 as shown in FIG. 5, for example, and the upper and lower connection ports have a refractory two-layer structure in which the inner pipe is made of hard vinyl chloride and the outer pipe is made of fiber-mixed mortar. The vertical pipes 18 and 18 made of pipes are connected by an adhesive, and the branch pipe 19 made of the same fireproof double-layer pipe for a toilet bowl or the like is connected to the branch pipe connection port 9 in the same manner to perform piping work. In the case of the illustration, the closing device 1 of the present invention is connected to a connection port 9 that is not scheduled to be used for the time being among the three connection ports. The details of the connection state are as clearly shown in the cross-sectional view of FIG. 4. Adhesive is applied to the peripheral surface of the insertion allowance 10 of the short pipe 3, and the female branch pipe connection port 9 of the collecting pipe joint 2 is applied. It is inserted and joined, and the insertion allowance 10 is designed so that the fiber-mixed mortar layer 2b of the collecting pipe joint 2 and the mortar pipe 6 are continuous, so that the closing port 1 of the closing pipe 1 is connected from the connection port 9 of the collecting pipe joint 2. Up to the cap 5 at the end is in a state where fireproof armor is applied. Further, since the closing device 1 is attached by adhesion, the waterproof property can be maintained well for a long time without looseness.

  When there is a demand to open the branch pipe connection port 9 closed by the closure device 1 for reform or other reasons, the tape-shaped joint 7 is first peeled to expose the gap 11, and a blade 13 such as a saw is entered into the gap 11. Then, the short pipe 3 is cut, the cap 5 is removed, and the loosely fitted mortar pipe 6 is removed as shown in FIG. As a result, the remaining half of the short pipe 3 protrudes from the connection port 6, and a commercially available two-layer fireproof pipe socket 20 is joined to the half by an adhesive, and a new fire-resistant two-layer pipe is connected thereto. A drainage system can be easily added by connecting the branch pipes 21.

  The details of an example of the pipe socket 20 are as shown in FIG. 7, and the outer periphery of a synthetic resin inner pipe 20a formed on both sides in a female mold is covered with a fiber-containing mortar coating layer 20b. One end of the pipe is fitted into the half short pipe 3 to which the adhesive is applied, and the branch pipe 21 is connected to the other end to complete a drainage system composed of a fireproof double-layer pipe as shown in FIG. The length of the mortar pipe 6 is formed so as to coincide with the insertion depth 22 of the inner pipe 20a of the pipe socket 20. By matching this, the covering of the fiber-mixed mortar layer 2b of the collective pipe joint 2 is made. It is possible to prevent the inner pipes made of synthetic resin from being damaged by heat at the time of fire.

  Even in a situation where the number of drainage systems is not fixed, it becomes possible to prepare the collecting pipe joint 2 having many branch pipe connection ports 9 in advance and proceed with the piping work. There is an advantage that it can be easily handled by cutting 1 and shorten the construction time.

Overall side view of the device of the invention Sectional drawing of the 2-2 line part of FIG. Partial cut perspective view of tape joint Cut-away side view of the device of the present invention Side view of the device of the present invention in use Side view of the operating state of the device of the present invention Cross section of piping socket Side view of expanded piping

Explanation of symbols

  1 Closure device for fireproof two-layer collecting pipe joint, 2a Inner pipe, 2b Fiber mixed mortar layer, 2 Fireproof two layer collecting pipe joint, 3 Short pipe, 4 Fiber mixed mortar, 5 Cap, 6 Mortar pipe, 7 Tape joint 8 end, 9 branch pipe connection port, 10 insertion allowance, 11 gap, 13 blade, 20 piping socket,

Claims (3)

  A short pipe made of synthetic resin, one end of which is fitted and bonded to the branch pipe connection port provided in the inner pipe of the synthetic resin joint of the refractory two-layer collecting pipe joint, and the fiber is mixed with the other end of the short pipe. A synthetic resin cap coated with mortar, a mortar tube made of fiber-mixed mortar loosely fitted on the outer periphery of the short tube while leaving a fitting allowance to the branch pipe connection port, and the cap and mortar tube A fireproof double-layer pipe joint closure device comprising a fireproof tape-like joint wound around the outer peripheral surface of the connecting portion of the joint.   The closure device for a fireproof two-layer assembly pipe joint according to claim 1, wherein a gap is provided between the mortar pipe and the cap so that a blade for cutting a short pipe can enter.   The length of the mortar pipe is set to a length suitable for fitting a pipe socket, and the outer diameter of the mortar pipe is formed larger than the outer diameter of the inner pipe of the joint. Closure device for laminated pipe joints.

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